The Penobscot Narrows Observatory & Fort Knox State Historic Site

04/28/2026

The Penobscot Narrows Bridge is one of only four bridges in the world with a public observatory built right into its tower. Experience those incredible views for yourself when we reopen on May 1st!

www.maine.gov/dot/pnbo

10/27/2025

The Penobscot Narrows Bridge Observatory will close for the season on October 31. Don’t miss your chance to visit before it closes!

www.maine.gov/dot/pnbo

05/01/2025

Explore Historic Fort Knox to visit the tallest public bridge observatory in the world! Ride Maine’s fastest elevator up 420 feet for breathtaking 360-degree views of the Penobscot Bay area. The observatory is open May 1st through October 31st. Come experience the wonder!
For more information visit: www.mainedot.gov/pnbo/

05/22/2024

04/26/2024

Explore Historic Fort Knox to visit the tallest public bridge observatory in the world! Ride Maine’s fastest elevator up 420 feet for breathtaking 360-degree views of the Penobscot Bay area. PNBO is open May 1st through October 31st. Come experience the wonder!
Open 9:00 a.m. to 5:00 p.m. in May/June/September/October, and until 6:00 p.m. in July and August.

740 Fort Knox Road; Prospect, Maine

10/31/2023

The observatory is now closed for the season! We'll see you in May!

10/03/2023

Don't wait! The observatory closes at the end of October for the season.

mainedot.gov/pnbo/rates/